1. 2. Graph: Lesson 3.1& 3.2, Systems Most Missed on Test Write an Inequality for the graph: 3. ANSWER 4. ANSWER
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Lesson 3.1-Solve By Graphing Lesson 3.2-Solve Algebraically Systems 3
Where the lines intersect
3 ways to kill a Vampire 1. Stake to the heart 2. Sunlight …unless your Edward 3. Garlic & a Cross
3 ways to solve Linear Systems 1. By Graphing 2. By Substituting 3. Eliminating
-graph both lines, -then find where the lines intersect Equation 1 Equation 2
-1 st make sure one equation has a variable isolated In this case, one already is: x = -2y nd Substitute the expression into other equation Equation 1 x = -2y + 2 Equation y = 16 -2y + 2 x 3( )+ y = 16 -6y y = 16 -5y + 6 = 16 -5y = 10 y = -2 (, )y rd Substitute answer into one of the equations 3x + = 16y (-2) x = 6 x 6
-3 rd Substitute answer into one of the equations -1 st make sure one equation has a variable isolated -2 nd Substitute the expression into other equation
+ 0- y= 3 -1y = 3 y = 3x + y = x + = -9 3x -3 = -9 x = -2 (-2,-3)3x = -6
- 0-6y=-24 -6y =-24 y = 3x + 2y = x + 2 = 26 3x + 8 = 26 3x = 18 (6, 4) 3x + 2y = 26 ( ) x = 6
Equation 1 3x – 3y = 21 -Multiply Equation 1 by 2 6x – 6y = 42 8x + 6y = -14 Equation 2 8x + 6y = -14 Equation 1 (2)3x – (2)3y = (2) x+ 0= 28 14x = 28 x = 3x - 3y = y = y = 21 -3y = 15 (2, -5) y = -5 ( )
Classwork: SW: pg.339, evenpg.339, even pg.341, 1-17 eoo
Classwork: SW: pg.339, evenpg.339, even pg.341, 1-17 eoo